org.apache.camel.component.file.strategy

Class MarkerFileExclusiveReadLockStrategy

java.lang.Object

org.apache.camel.component.file.strategy.MarkerFileExclusiveReadLockStrategy

All Implemented Interfaces:

GenericFileExclusiveReadLockStrategy<File>

Direct Known Subclasses:

FileChangedExclusiveReadLockStrategy, FileLockExclusiveReadLockStrategy

public class MarkerFileExclusiveReadLockStrategy
extends Object
implements GenericFileExclusiveReadLockStrategy<File>

Acquires read lock to the given file using a marker file so other Camel consumers wont acquire the same file. This is the default behavior in Camel 1.x.

Constructor Summary

Constructors

Constructor and Description
MarkerFileExclusiveReadLockStrategy()

Method Summary

Modifier and Type	Method and Description
boolean	acquireExclusiveReadLock(GenericFileOperations<File> operations, GenericFile<File> file, Exchange exchange) Acquires exclusive read lock to the file.
protected void	doReleaseExclusiveReadLock(GenericFileOperations<File> operations, GenericFile<File> file, Exchange exchange)
void	prepareOnStartup(GenericFileOperations<File> operations, GenericFileEndpoint<File> endpoint) Allows custom logic to be run on startup preparing the strategy, such as removing old lock files etc.
void	releaseExclusiveReadLockOnAbort(GenericFileOperations<File> operations, GenericFile<File> file, Exchange exchange) Releases the exclusive read lock granted by the acquireExclusiveReadLock method due an abort operation (acquireExclusiveReadLock returned false).
void	releaseExclusiveReadLockOnCommit(GenericFileOperations<File> operations, GenericFile<File> file, Exchange exchange) Releases the exclusive read lock granted by the acquireExclusiveReadLock method due a commit operation (Exchange processing succeeded)
void	releaseExclusiveReadLockOnRollback(GenericFileOperations<File> operations, GenericFile<File> file, Exchange exchange) Releases the exclusive read lock granted by the acquireExclusiveReadLock method due a rollback operation (Exchange processing failed)
void	setCheckInterval(long checkInterval) Sets the check interval period.
void	setDeleteOrphanLockFiles(boolean deleteOrphanLockFiles) Sets whether orphan marker files should be deleted upon startup
void	setMarkerFiler(boolean markerFile) Sets whether marker file should be used or not.
void	setReadLockLoggingLevel(LoggingLevel readLockLoggingLevel) Sets logging level used when a read lock could not be acquired.
void	setTimeout(long timeout) Sets an optional timeout period.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MarkerFileExclusiveReadLockStrategy

public MarkerFileExclusiveReadLockStrategy()

Method Detail

prepareOnStartup

public void prepareOnStartup(GenericFileOperations<File> operations,
                             GenericFileEndpoint<File> endpoint)

Description copied from interface: GenericFileExclusiveReadLockStrategy

Allows custom logic to be run on startup preparing the strategy, such as removing old lock files etc.

Specified by:

prepareOnStartup in interface GenericFileExclusiveReadLockStrategy<File>

Parameters:

operations - generic file operations

endpoint - the endpoint

acquireExclusiveReadLock

public boolean acquireExclusiveReadLock(GenericFileOperations<File> operations,
                                        GenericFile<File> file,
                                        Exchange exchange)
                                 throws Exception

Description copied from interface: GenericFileExclusiveReadLockStrategy

Acquires exclusive read lock to the file.

Specified by:

acquireExclusiveReadLock in interface GenericFileExclusiveReadLockStrategy<File>

Parameters:

operations - generic file operations

file - the file

exchange - the exchange

Returns:

true if read lock was acquired. If false Camel will skip the file and try it on the next poll

Throws:

Exception - can be thrown in case of errors

releaseExclusiveReadLockOnAbort

public void releaseExclusiveReadLockOnAbort(GenericFileOperations<File> operations,
                                            GenericFile<File> file,
                                            Exchange exchange)
                                     throws Exception

Description copied from interface: GenericFileExclusiveReadLockStrategy

Releases the exclusive read lock granted by the acquireExclusiveReadLock method due an abort operation (acquireExclusiveReadLock returned false).

Specified by:

releaseExclusiveReadLockOnAbort in interface GenericFileExclusiveReadLockStrategy<File>

Parameters:

operations - generic file operations

file - the file

exchange - the exchange

Throws:

Exception - can be thrown in case of errors

releaseExclusiveReadLockOnRollback

public void releaseExclusiveReadLockOnRollback(GenericFileOperations<File> operations,
                                               GenericFile<File> file,
                                               Exchange exchange)
                                        throws Exception

Description copied from interface: GenericFileExclusiveReadLockStrategy

Releases the exclusive read lock granted by the acquireExclusiveReadLock method due a rollback operation (Exchange processing failed)

Specified by:

releaseExclusiveReadLockOnRollback in interface GenericFileExclusiveReadLockStrategy<File>

Parameters:

operations - generic file operations

file - the file

exchange - the exchange

Throws:

Exception - can be thrown in case of errors

releaseExclusiveReadLockOnCommit

public void releaseExclusiveReadLockOnCommit(GenericFileOperations<File> operations,
                                             GenericFile<File> file,
                                             Exchange exchange)
                                      throws Exception

Description copied from interface: GenericFileExclusiveReadLockStrategy

Releases the exclusive read lock granted by the acquireExclusiveReadLock method due a commit operation (Exchange processing succeeded)

Specified by:

releaseExclusiveReadLockOnCommit in interface GenericFileExclusiveReadLockStrategy<File>

Parameters:

operations - generic file operations

file - the file

exchange - the exchange

Throws:

Exception - can be thrown in case of errors

doReleaseExclusiveReadLock

protected void doReleaseExclusiveReadLock(GenericFileOperations<File> operations,
                                          GenericFile<File> file,
                                          Exchange exchange)
                                   throws Exception

Throws:

Exception

setTimeout

public void setTimeout(long timeout)

Description copied from interface: GenericFileExclusiveReadLockStrategy

Sets an optional timeout period.

If the readlock could not be granted within the time period then the wait is stopped and the acquireExclusiveReadLock method returns false.

Specified by:

setTimeout in interface GenericFileExclusiveReadLockStrategy<File>

Parameters:

timeout - period in millis

setCheckInterval

public void setCheckInterval(long checkInterval)

Description copied from interface: GenericFileExclusiveReadLockStrategy

Sets the check interval period.

The check interval is used for sleeping between attempts to acquire read lock. Setting a high value allows to cater for slow writes in case the producer of the file is slow.

The default period is 1000 millis.

Specified by:

setCheckInterval in interface GenericFileExclusiveReadLockStrategy<File>

Parameters:

checkInterval - interval in millis

setReadLockLoggingLevel

public void setReadLockLoggingLevel(LoggingLevel readLockLoggingLevel)

Description copied from interface: GenericFileExclusiveReadLockStrategy

Sets logging level used when a read lock could not be acquired.

Logging level used when a read lock could not be acquired.

The default logging level is WARN

Specified by:

setReadLockLoggingLevel in interface GenericFileExclusiveReadLockStrategy<File>

Parameters:

readLockLoggingLevel - LoggingLevel

setMarkerFiler

public void setMarkerFiler(boolean markerFile)

Description copied from interface: GenericFileExclusiveReadLockStrategy

Sets whether marker file should be used or not.

Specified by:

setMarkerFiler in interface GenericFileExclusiveReadLockStrategy<File>

Parameters:

markerFile - true to use marker files.

setDeleteOrphanLockFiles

public void setDeleteOrphanLockFiles(boolean deleteOrphanLockFiles)

Description copied from interface: GenericFileExclusiveReadLockStrategy

Sets whether orphan marker files should be deleted upon startup

Specified by:

setDeleteOrphanLockFiles in interface GenericFileExclusiveReadLockStrategy<File>

Parameters:

deleteOrphanLockFiles - true to delete files, false to skip this check